One shell gas manufacturing set with marginal blast



June 26, 1934. L, HALL 1,964,285

ONE SHELL GAS MANUFACTURING SET WITH MARGINAL BLAST Filed Nov. 28, 1930 Patented June 26, 1934 UNETED STATES PATENT Fries ONE SHELL GAS MANUFACTURING SET WllTH MABGENAL BLAST Edwin L. Hall, Philadelphia, Pa., assignor to The United Gas Improvement Company,

Phila- 1 Claim.

The present invention relates to the manufacture of carburetted water gas.

It is particularly adapted for employment when heavy oil is used as the carburetting material. By heavy oil I mean to include those oils and residuums which deposit large quantities of carbon in the checkerbrick, if vaporized in the ordinary carburetter. Examples of such oil are socalled bunker oil or bunker C oil.

The object or the invention is the provision of improved and economical apparatus for the manufacture of carburetted water gas particularly adapted for the use of heavy oil.

The invention will be described in connection 1 with the attached drawing which forms a part of this specification and which shows for illustration a form of the apparatus of the invention, in partial elevation and partial vertical cross section.

Referring to the drawing,

The single shell 1, includes the water gas generator, carburetter and superheater. It is provided with the grate 2, which may be stationary as shown or which may be a mechanical grate. The grate supports the fuel bed 3. 4 is a coaling door. Above the ccaling door is provided the checkerbrick 5, supported by any suitable means as the arches 6.

There is further provision of the air blast supply means '7 and steam supply means 8, for up air blasting and up steaming respectively. There is also provided means for marginally blasting the top of the fuel bed, illustrated as the air supply pipe 9, bustle pipe 10 and connections 11. 12 is an oil spray adapted to spray oil on the marginal zone at the top of the fuel bed heated by the blast through connections 11.

13 is the stack valve, i l the connection for uprun gas leading through the three way valve 15 to the wash box 16. Connection 1'? leads from below the fuel bed through the three way valve 15 to the wash box. The ofltake 18 leads from the wash box to a gas holder for storage not shown. 19 is a steam supply means for down steaming.

In operation the fuel bed is blasted with air supplied through 7, storing heat in the fuel bed and generating producer gas, which is burned by secondary introduced as a marginal blast through connections 11. This secondary blast produces a marginal hot zone at the top of the fuel bed. The blast products pass upward storing their heat in the checkerbrick 5 and thence through the stack valve 13 to atmosphere.

When the required heat is stored in the fuel bed including the marginal hot zone and in the check-- erbrick the blast is terminated and the stack valve closed.

An uprun may now be made admitting steam through supply 8, passing it up through the fuel bed thereby generating blue water gas. During the uprun oil. is sprayed by spray 12 onto the marginal hot zone at the top of the fuel bed, and vaporized by the heat stored there. The resultant oil vapors pass with the blue water gas up through the checkerbrick 5 and are fixed by the stored heat to produce carburetted water gas which passes through connection 14 and valve 15 to the wash box 16 and thence to storage.

After the uprun valve 15 is reversed and a downrun is made with steam introduced at 19, superheated in the checkerbrick 5 and passed down through the fuel bed. The resultant blue water gas passing through connection 17 and valve 15 to the wash box and thence to storage.

After a short uprun to purge the apparatus the cycle may be repeated.

The provision of the marginally heated zone at the top of the fuel bed for vaporization of the oil permits a decrease in the amount of checkerbrick surface required as compared with the ordinary carburetted water gas apparatus on which the heated checkerbrick is employed for both vaporization and fixing.

Also, when employing heavy oil for carburetting, the characteristics of the oil are such that although a large quantity of heat is required for vaporization, a smaller-quantity of heat is required for fixing than with ordinary gas oil.

This permits the consolidation of the set into the one shell set without sacrifice of efficiency v and without requiring a vessel of undue height, providing a water gas set which is very economical in construction and which is very compact.

The applicant is aware of the fact that one shell sets have been previously proposed and employed. They have not, however, included means for blasting the top of the fuel bed marginally with secondary air and means to spray oil onto this marginal hot zone. The provision of these means permits the provision of a one shell set which is both economical of construction and eflicient and is particularly adapted for the employment of heavy oil for carburetting material. The one shell set is particularly adapted to the inclusion of the above means of vaporizing the oil. Due to the secondary blast an increased quantity of gases pass through the top of the fuel bed during the blasting operation, with an increase in gas velocity and an increase in the tendency to lift particles of fuel from the fuel bei' containing refractory material in its upper portion, air inlet means and steam inlet means and gas offtake means at the bottom of said shell, means for introducing secondary air to the shell adjacent the upper marginal edge of the fuel bed, means for spraying oil directly on the top of the fuel bed, and steam inlet means and gas offtake means leading to storage at the top of the shell.

EDWIN L. HALL. 

